What does it mean when you and a guy have been flirting for awhile then he suddenly says “hey sis”?

Anonymous

We work together. But from the moment I meet him he has always flirted with me and would even give me very detailed compliments. I would definitely always reciprocate the vibes back to kind of let him know that I am also interested in him. We would crush on each a lot. When we see each other in the hallways, we always speak to each other or walk together. But now I’m confused. I went in to work today, he was near the door that I entered. He was speaking with one of his female coworkers, which is fine because I didn’t feel insecure or jealous about it. I looked at him and said hi how we normally do with each other, he replied saying “hey sis”. “Hey sis”? SMH. At this point, I don’t know if I am over reacting as a taurus but I feel so confused and pretty much over it. I don't know if he said that so no one in our work space would be nosy, but I was definitely confused and upset about it. I told my close friend about the situation, she says that I maybe over reacting. Ugh the Taurus in me wants to give off a f you attitude but I know that if I do do that he’ll know that I feeling some type of way. I don't know how should I react to this situation?

What does it mean when you and a guy have been flirting for awhile then he suddenly says “hey sis”?
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